JP2516179Y2 - Information card device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A Field of Industrial Application The present invention relates to an information card device, and is particularly suitable for application to contactless writing of card information.

B Outline of the Invention In the information card device, the present invention modulates the card information from the information writing device into a high frequency signal and writes it in the memory of the information card through the electric field, and at the same time, the card information of the memory is written in the information card. Therefore, by emitting the card information by changing the coupling impedance of the electromagnetic field, it is possible to write and read the information on the information card without contact.

C Conventional Technology As an information card reader for reading card information of a conventional information card, as shown in FIG. 4, for example, 2.45 [GH
The response request signal W1 having the microwave of [z] as a carrier wave is generated in the response request signal generation circuit 2 of the information reading device 1, is emitted from the transmitting antenna 3 to the information card 4, and is returned from the information card 4. By incorporating the information signal W2 into the response signal processing circuit 6 via the receiving antenna 5 of the information reading device 1, an entry / exit person who holds the information card 4 as, for example, an entry / exit certificate, or the information card 4 is attached as a tag. It is considered to build an information card reading system such as checking existing cargo.

As an information card 4 applicable to such an information card reading system, a dipole antenna 4B attached so as to form a part of a wiring pattern on a wiring board 4A, and an integrated circuit (IC) forming an information signal generating circuit. By connecting the information signal generation circuit 4C of the configuration and the power supply battery 4D by the wiring pattern 4E, by changing the impedance at the feeding point of the dipole antenna 4B according to the information signal generated in the information signal generation circuit 4C. It has been proposed that the reflected wave is returned as a response information signal W2 by changing the reflectance with respect to a carrier wave emitted as a response request signal W1 from the information reading device 1 (Japanese Patent Application No. 63-63).
−6292).

The information signal generating circuit 4C has an electric circuit configuration as shown in FIG. 5, and converts the information data S1 previously stored in the information memory 11 composed of, for example, a PROM into the clock signal S2 of the clock oscillating circuit 12. Therefore, the address signal is read by the address signal S3 of the address counter 13 that performs the counting operation, and is supplied to the impedance variable circuit 14 formed of, for example, a field effect transistor.

The impedance variable circuit 14 is connected between the pair of feeding point terminals T1 and T2, and thus the information data S1 is logical "1".
Alternatively, the field effect transistor is turned on or off when the logic “0” is reached, so that the feeding point terminals T1 and T2 are turned on.
The impedance at the feeding point of the dipole antenna 4B connected to is variably controlled, and thus the reflectance for the response request signal W1 incident on the dipole antenna 4B is variably controlled.

A power supply battery 4D is connected between the ground-side power feed point terminal T1 and the power supply terminal T3 of the information signal generation circuit 4C, which continuously and continuously performs variable impedance control at the power feed point of the dipole antenna 4B by the information data S1. It is designed to get you.

A unique identification code is assigned to each information card 4 in the information memory 11, so that the information reading device 1 can reliably read the information held by the information card 4.

D Problems to be Solved by the Invention By the way, when writing information in advance to the information card 4, a method of writing information by bringing an electrode of a writing device into contact with a predetermined electrode of the information card 4 Is being considered.

However, when attempting to write information by contacting each information card in this way, there is a problem that the production process is complicated when a large number of information cards are produced, resulting in a decrease in production efficiency. .

As one method for solving this problem, a polar plate adapted to input an information signal is formed on an information card, and the polar plate is provided on an external writing device for writing. A method has been proposed in which an electric field is formed by being brought close to a plate, and an information signal from a writing device is input via the electric field in a non-contact manner (Japanese Patent Laid-Open No. 63-39396).

However, in the method of inputting an information signal by electric field coupling, there is a problem that an input capacitance is generated in a circuit forming the information card and the input signal waveform is deteriorated due to the time constant of the input capacitance.

For example, FIG. 3 (A) to show such a write information signal S _w is input to the I connexion information card in electric field coupling, if the time constant of the input capacitance is small, is input to the information card input The information signal S _IN1 has a problem that the input information signal S _IN1 cannot be surely converted into information data due to the waveform distortion as shown in FIG. 3 (D).

The present invention has been made in view of the above points, and proposes an information card device that can prevent deterioration of the input signal waveform even when an information signal is input by electric field coupling. .

E Means for Solving the Problems In order to solve the problems, in the present invention, a first pair of electrode plates 28A and 28B provided on the information writing device 21 are provided.
The card information from the information writing device 21 is written in the information card 22 in a non-contact manner via an electric field formed between the second pair of electrode plates 29A and 29B provided in the information card 22. in the information card system, the information writing device 21 forms a transmission signal S _EN1 by modulating a carrier signal S _F having a frequency higher than the frequency of the I connexion the write information S _W to write information S _W, The transmission signal S _EN1 is transmitted to the first pair of electrode plates 28A, 28B.
Write information for detecting write information from the transmission signal S _EN2 obtained on the second pair of electrode plates 29A, 29B. A detector 32, a memory 11 for storing the write information detected by the write information detector 32 as card information, and an electrode formed on the card substrate and coupled to the information reader 1 via an electromagnetic field. Card information transmission means for transmitting the card information to the information reading means 1 by reading the pattern 36 and the card information stored in the memory 11 and changing the coupling impedance of the electrode pattern 36 to the electromagnetic field according to the card information. 14 and so on.

In F acting information writing device 21, after modulating a carrier signal S _EN1 having a frequency higher writing information S _W, and sends the I connexion information card 22 to the electric field coupling.

Further, in the information card, the card information is released by changing the coupling impedance of the electromagnetic field between the electrode pattern 36 and the information reading device 1 based on the card information.

Thus, the card information can be surely written and read in a contactless manner on the information card 22 having a simple structure.

G Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1 in which parts corresponding to those in FIG. 4 are denoted by the same reference numerals, the information writing device 21 of the information card device 20 has a writing signal generated by the writing signal generating circuit 23 based on predetermined information data. write information signal S _W (FIG. 3 (a)), for example, 100 [k
bps] at the data transfer rate baseband signal multiply circuit 2
Send to 4.

On the other hand, the frequency signal generating circuit 25 is, for example, 100 [MH
z] is multiplied by the reference frequency signal S _F having a high frequency.
Input to the modulated signal S obtained by amplitude-modulating the reference frequency signal S _F based on the write information signal S _W.
EN1 (FIG. 3 (B)) is sent to the writing plates 28A and 28B via the subsequent amplifier circuit 26.

Therefore, the modulation signal S _{EN1 is applied} between the writing plates 28A and 28B.
The voltage is changed according to.

On the other hand, in the information card 22, as shown in FIG. 2, the electrode plates 29A and 29B and the loop-shaped electrode pattern 36 form a part of the wiring pattern on the same plane of the wiring board 4A. The information card 22 is connected to the integrated circuit 30 and the surface of the information card 22 is sealed by a sheet-shaped sealing member.

Further, the electrode plates 29A and 29B are formed in a rectangular shape of approximately 8 × 15 [mm], and when the information card 22 is brought close to the information writing device 21, the electrode plates 29A and 29B substantially face the writing electrode plates 28A and 28B. It is designed to get you.

Therefore, the electrode plates 29A and 29B are used as electrode plates for data input, and the information card 22 is used as an information writing device.
The electric field can be formed between the writing electrode plates 28A and 28B of the information writing device 21 and the electrode plates 29A and 29B by approaching the electrode 21 at a predetermined distance.

Therefore, the write electrode plate 2 is referenced with reference to the potential of the write electrode plate 28B.
The electric field is excited by the modulation signal S _EN1 input to 8 A,
As a result, the input modulation signal S _EN2 corresponding to the modulation signal S _EN1 is generated in the electrode plate 29A with the electrode plate 29B as the reference potential.

Further, the input modulation signal S _EN2 is sent to the detection circuit 32 composed of a diode and subjected to envelope detection, so that an input corresponding to the write information signal S _W as shown in FIG. Obtain the information signal S _IN2 .

Thus, the input information signal S _IN2 continues to the information signal processing circuit 34.
After being sent to the card and subjected to predetermined signal processing, it is stored in the memory circuit in the information signal processing circuit 34 as card information data.

On the other hand, when the information is read from the memory circuit of the information signal processing circuit 34, the information signal generating circuit 4C (FIG. 5) provided in the information signal processing circuit 34 uses the stored card information data as a basis. The field effect transistor 14 is controlled to be turned on and off by the above, and the impedance of the electrode pattern 36 whose both ends are connected to the field effect transistor 14 is changed.

Therefore, the electrode pattern 36 is brought close to an information reading coil of an information reading device (not shown) to form an induction electromagnetic field so that the stored information data is transmitted in a non-contact manner.

Along with this, since the electrode pattern 36 is formed to have a length corresponding to one wavelength of the microwave, the response request signal W1 sent from the information reading device 1 (FIG. 4) using the microwave as a carrier is stored. By reflecting the information data at a predetermined reflectance and returning it as the response information signal W2, the information data is transmitted in a contactless manner using microwaves.

Therefore, the information card 22 stores the stored card information data,
The information reading device of the proximity reading type can be made to read by the induction electromagnetic field coupling, and the information reading device 1 of the long distance reading type using microwaves (fourth
(Figure) can be read.

Therefore, the information card 22 can be selectively used as a proximity reading type or a long distance reading type information card as needed.

In the above configuration, the information writing device 21
If to write the write information signal S _W from a write plate 28A and the electrode plate 29A in close proximity information card 22 to the information writing device 21, and a write plate 28B and plate 29B Number of each (m
[m]] and make them close to each other.

At this time, the modulation signal input to the writing plates 28A and 28B
Since S _EN1 is configured with a high frequency based on the reference frequency signal S _F , the writing polar plate 28A and the polar plate 29A,
A modulation signal is generated on the side of the polar plates 29A and 29B of the information card 22 via the electric field formed between the polar plate for writing 28B and the polar plate 29B.
An input modulation signal S _EN2 with a high frequency similar to S _EN1 is generated.

Therefore, in the electrode plate 29A, charging / discharging is repeated at a period significantly shorter than the time constant of the input capacitance of the integrated circuit 30, so that the amplitude of the input modulation signal S _EN2 generated in the electrode plate 29A varies. Instead, it is input to the detection circuit 32.

Thus, the input information signal S _IN2 obtained by envelope detection of the input modulation signal S _EN2 in the detection circuit 32 causes waveform distortion due to the input capacitance of the integrated circuit 30 as in the conventional case (FIG. 3 (D)). Instead, it is sent to the information signal processing circuit 34 as a rectangular wave as shown in FIG.

Therefore, in the information signal processing circuit 34, the input information signal
By processing S _IN2 with a threshold value of a predetermined level,
The information signal processing circuit 34 uses this as card information data.
It is stored in a memory circuit provided inside.

Thus the write information signal S _W sent in the information writing device 21 can is inputted to the information card 22 in a non-contact, and stores this in the information card 22 as reliably card information data.

According to the above configuration, the modulated signal S _EN1
I'm the go-between writing information signal S _W in the electric field coupling connexion information card
Since it is sent to the 22 side, the input information signal S
Card information data can be reliably stored without causing waveform distortion in _IN2 .

In doing so, the card information data from the information writing device 21 can be surely written to the information card 22 without contact.

In the above embodiment, the write information signal _SW is
Although the case of using 100 kbps has been described, the present invention is not limited to this, and the present invention can be applied to the case of using a write information signal transmitted at various other data transfer rates.

In the above embodiment, the case where the reference frequency signal S _F of 100 [MHz] is used has been described, but the present invention is not limited to this, and the point is that it is higher than the frequency of the write information signal S _W. Any frequency signal will do.

Further, in the above-described embodiment, the polar plate 29 of the information card 22 is used.
The case where each of A and 29B is configured as a part of the wiring pattern has been described, but instead of this, the negative surface of the power supply battery provided on the information card 22 may be used as the electrode plate 29B.

Further, in the above-mentioned embodiment, the case where the writing electrode plates 28A, 28B and the electrode plates 29A, 29B having a rectangular shape of 8 × 15 [mm] is used, but the present invention is not limited to this. ,
Various other sizes and shapes may be applied.

Further, in the above-mentioned embodiment, the case where the information is written in the information card 22 by the electric field coupling has been described, but the present invention is not limited to this, and the shape of the electrode plates 29A and 29B of the information card 22 is set to the microwave. If it is formed to have a length corresponding to a half wavelength, it is possible to write information on the information card 22 at a long distance by using microwaves.

Further, in the above-described embodiment, the proximity type information reading device which reads information from the information card 22 by the induction electromagnetic coupling by the electrode pattern 36 and the long distance reading type information reading device 1 (fourth) using microwaves. I described the case of writing information to the information card 22 that can support both
The information card 22 is not limited to this, and the present invention can be applied to a proximity read-only type or a long-distance read-only type information card.

Further, in the above-described embodiment, the case where the identification card for entrance and exit is used as the information card 22 is described, but the information card is not limited to this, for example, a tag for cargo, an IC card,
The present invention can be widely applied to the case where a card such as a commuter ticket for a train or a shape other than the card is used.

H Effect of the Invention As described above, according to the present invention, the card information is sent to the information card by the high frequency carrier signal, so that the deterioration of the input information signal waveform in the information card is prevented. As a result, the card information can be surely written on the information card without contact.

In this way, since a simple configuration for simply changing the coupling impedance between the information reading device and the information reading device for transmitting the card information to the information reading device according to the card information can be adopted, as a whole An information card device having a simple configuration can be realized.

[Brief description of drawings]

FIG. 1 is a connection diagram showing an embodiment of an information card device according to the present invention, FIG. 2 is a schematic perspective view showing the overall configuration of the information card device, and FIG. 3 is a signal waveform diagram used for explaining the operation thereof. FIG. 4 is a schematic diagram showing the configuration of the information card reading system, and FIG. 5 is a schematic block diagram showing the electrical configuration of the information card. 1 ... Information reading device, 4, 22 ... Information card, 4C ... Information signal generating circuit, 20 ... Information card device, 21 ... Information writing device, 23 ... Write signal generating circuit, 24 ... Multiplier circuit, 25
...... Frequency generator circuit, 28A, 28B ...... Write pole plate, 29A, 2
9B ... Pole plate, 30 ... Integrated circuit, 32 ... Detection circuit, 34 ...
Information signal processing circuit, 36 ... Electrode pattern.

Claims (1)

(57) [Scope of utility model registration request] 1. The above information writing via an electric field formed between a first pair of electrode plates provided in the information writing device and a second pair of electrode plates provided in the information card. In an information card device adapted to write the card information from the device to the information card in a contactless manner, the information writing device modulates a carrier signal having a frequency higher than the frequency of the card information by the card information. And a transmission signal forming means for supplying the transmission signal to the first pair of electrode plates, and the information card includes the transmission signal obtained by the second pair of electrode plates. A write information detecting means for detecting the card information from a signal, a memory for storing the card information detected by the write information detecting means, and an electromagnetic field formed on the card substrate to the information reading device. An electrode pattern for coupling to, by changing the coupling impedance for the electromagnetic field of the electrode pattern in accordance with the card information is read the card information stored in the memory,
An information card device, comprising: card information transmitting means for transmitting the card information to the information reading means.